Two coaxial solenoids of different radius carry current I in the same direction. `vec(F_1)` be the magnetic force on the inner solenoid due to the outer one and `vec(F_2)` be the magnetic force on the outer solenoid due to the inner one. Then

Options

A. `vecF_(1) = vecF_(2) = 0 `
B. `vecF_(1)` is radially inwards and `vecF_(2)` is radially outwards
C. `vecF_(1)` is radially inwards and `vecF_(2) = 0 `.
D. `vecF_(1)` is radially outwards and `vecF_(2) = 0` .

Answer

A

Explanation

Magnetic field due to a solenoid is uniform and along the axis. Net magnetic force on closed loops will be zero. Thus, option (a) is correct.